SURFACE CHEMISTRY

Circle the molecules

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Science  25 Aug 2017:
Vol. 357, Issue 6353, pp. 769-770
DOI: 10.1126/science.357.6353.769-g

Supramolecular networks of molecular corrals that form on metal surfaces from aromatic molecules are usually driven by hydrogen bonding or other contacts within the plane and have π-interactions mainly with the metal surface. Jethwa et al. show that nonplanar 1,5-triazoles adsorbed on (111) close-packed surfaces of copper, silver, or gold can form rings of 11 to 18 molecules, whereas similar 1,4-triazoles adopt the conventional flat geometry. The 1,5-triazole links a biphenyl and a phenanthrene group; the first two groups lie flat against the metal surface, whereas the phenanthrenes tilt away from it and π-stack to form closed rings.

ACS Nano 10.1021/acsnano.7b03484 (2017).

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